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ffmpeg/libavcodec/dvbsubdec.c

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/*
* DVB subtitle decoding
* Copyright (c) 2005 Ian Caulfield
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avcodec.h"
#include "get_bits.h"
#include "bytestream.h"
#include "internal.h"
#include "libavutil/colorspace.h"
#define DVBSUB_PAGE_SEGMENT 0x10
#define DVBSUB_REGION_SEGMENT 0x11
#define DVBSUB_CLUT_SEGMENT 0x12
#define DVBSUB_OBJECT_SEGMENT 0x13
#define DVBSUB_DISPLAYDEFINITION_SEGMENT 0x14
#define DVBSUB_DISPLAY_SEGMENT 0x80
#define cm (ff_crop_tab + MAX_NEG_CROP)
#ifdef DEBUG
static void png_save(const char *filename, uint32_t *bitmap, int w, int h)
{
int x, y, v;
FILE *f;
char fname[40], fname2[40];
char command[1024];
snprintf(fname, sizeof(fname), "%s.ppm", filename);
f = fopen(fname, "w");
if (!f) {
perror(fname);
return;
}
fprintf(f, "P6\n"
"%d %d\n"
"%d\n",
w, h, 255);
for(y = 0; y < h; y++) {
for(x = 0; x < w; x++) {
v = bitmap[y * w + x];
putc((v >> 16) & 0xff, f);
putc((v >> 8) & 0xff, f);
putc((v >> 0) & 0xff, f);
}
}
fclose(f);
snprintf(fname2, sizeof(fname2), "%s-a.pgm", filename);
f = fopen(fname2, "w");
if (!f) {
perror(fname2);
return;
}
fprintf(f, "P5\n"
"%d %d\n"
"%d\n",
w, h, 255);
for(y = 0; y < h; y++) {
for(x = 0; x < w; x++) {
v = bitmap[y * w + x];
putc((v >> 24) & 0xff, f);
}
}
fclose(f);
snprintf(command, sizeof(command), "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename);
system(command);
snprintf(command, sizeof(command), "rm %s %s", fname, fname2);
system(command);
}
#endif
#define RGBA(r,g,b,a) (((unsigned)(a) << 24) | ((r) << 16) | ((g) << 8) | (b))
typedef struct DVBSubCLUT {
int id;
uint32_t clut4[4];
uint32_t clut16[16];
uint32_t clut256[256];
struct DVBSubCLUT *next;
} DVBSubCLUT;
static DVBSubCLUT default_clut;
typedef struct DVBSubObjectDisplay {
int object_id;
int region_id;
int x_pos;
int y_pos;
int fgcolor;
int bgcolor;
struct DVBSubObjectDisplay *region_list_next;
struct DVBSubObjectDisplay *object_list_next;
} DVBSubObjectDisplay;
typedef struct DVBSubObject {
int id;
int type;
DVBSubObjectDisplay *display_list;
struct DVBSubObject *next;
} DVBSubObject;
typedef struct DVBSubRegionDisplay {
int region_id;
int x_pos;
int y_pos;
struct DVBSubRegionDisplay *next;
} DVBSubRegionDisplay;
typedef struct DVBSubRegion {
int id;
int width;
int height;
int depth;
int clut;
int bgcolor;
uint8_t *pbuf;
int buf_size;
DVBSubObjectDisplay *display_list;
struct DVBSubRegion *next;
} DVBSubRegion;
typedef struct DVBSubDisplayDefinition {
int version;
int x;
int y;
int width;
int height;
} DVBSubDisplayDefinition;
typedef struct DVBSubContext {
int composition_id;
int ancillary_id;
int time_out;
DVBSubRegion *region_list;
DVBSubCLUT *clut_list;
DVBSubObject *object_list;
int display_list_size;
DVBSubRegionDisplay *display_list;
DVBSubDisplayDefinition *display_definition;
} DVBSubContext;
static DVBSubObject* get_object(DVBSubContext *ctx, int object_id)
{
DVBSubObject *ptr = ctx->object_list;
while (ptr && ptr->id != object_id) {
ptr = ptr->next;
}
return ptr;
}
static DVBSubCLUT* get_clut(DVBSubContext *ctx, int clut_id)
{
DVBSubCLUT *ptr = ctx->clut_list;
while (ptr && ptr->id != clut_id) {
ptr = ptr->next;
}
return ptr;
}
static DVBSubRegion* get_region(DVBSubContext *ctx, int region_id)
{
DVBSubRegion *ptr = ctx->region_list;
while (ptr && ptr->id != region_id) {
ptr = ptr->next;
}
return ptr;
}
static void delete_region_display_list(DVBSubContext *ctx, DVBSubRegion *region)
{
DVBSubObject *object, *obj2, **obj2_ptr;
DVBSubObjectDisplay *display, *obj_disp, **obj_disp_ptr;
while (region->display_list) {
display = region->display_list;
object = get_object(ctx, display->object_id);
if (object) {
obj_disp_ptr = &object->display_list;
obj_disp = *obj_disp_ptr;
while (obj_disp && obj_disp != display) {
obj_disp_ptr = &obj_disp->object_list_next;
obj_disp = *obj_disp_ptr;
}
if (obj_disp) {
*obj_disp_ptr = obj_disp->object_list_next;
if (!object->display_list) {
obj2_ptr = &ctx->object_list;
obj2 = *obj2_ptr;
while (obj2 != object) {
assert(obj2);
obj2_ptr = &obj2->next;
obj2 = *obj2_ptr;
}
*obj2_ptr = obj2->next;
av_free(obj2);
}
}
}
region->display_list = display->region_list_next;
av_free(display);
}
}
static void delete_state(DVBSubContext *ctx)
{
DVBSubRegion *region;
DVBSubCLUT *clut;
while (ctx->region_list) {
region = ctx->region_list;
ctx->region_list = region->next;
delete_region_display_list(ctx, region);
av_free(region->pbuf);
av_free(region);
}
while (ctx->clut_list) {
clut = ctx->clut_list;
ctx->clut_list = clut->next;
av_free(clut);
}
av_freep(&ctx->display_definition);
/* Should already be null */
if (ctx->object_list)
av_log(NULL, AV_LOG_ERROR, "Memory deallocation error!\n");
}
static av_cold int dvbsub_init_decoder(AVCodecContext *avctx)
{
int i, r, g, b, a = 0;
DVBSubContext *ctx = avctx->priv_data;
if (!avctx->extradata || avctx->extradata_size != 4) {
av_log(avctx, AV_LOG_WARNING, "Invalid extradata, subtitle streams may be combined!\n");
ctx->composition_id = -1;
ctx->ancillary_id = -1;
} else {
ctx->composition_id = AV_RB16(avctx->extradata);
ctx->ancillary_id = AV_RB16(avctx->extradata + 2);
}
default_clut.id = -1;
default_clut.next = NULL;
default_clut.clut4[0] = RGBA( 0, 0, 0, 0);
default_clut.clut4[1] = RGBA(255, 255, 255, 255);
default_clut.clut4[2] = RGBA( 0, 0, 0, 255);
default_clut.clut4[3] = RGBA(127, 127, 127, 255);
default_clut.clut16[0] = RGBA( 0, 0, 0, 0);
for (i = 1; i < 16; i++) {
if (i < 8) {
r = (i & 1) ? 255 : 0;
g = (i & 2) ? 255 : 0;
b = (i & 4) ? 255 : 0;
} else {
r = (i & 1) ? 127 : 0;
g = (i & 2) ? 127 : 0;
b = (i & 4) ? 127 : 0;
}
default_clut.clut16[i] = RGBA(r, g, b, 255);
}
default_clut.clut256[0] = RGBA( 0, 0, 0, 0);
for (i = 1; i < 256; i++) {
if (i < 8) {
r = (i & 1) ? 255 : 0;
g = (i & 2) ? 255 : 0;
b = (i & 4) ? 255 : 0;
a = 63;
} else {
switch (i & 0x88) {
case 0x00:
r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
a = 255;
break;
case 0x08:
r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
a = 127;
break;
case 0x80:
r = 127 + ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
g = 127 + ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
b = 127 + ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
a = 255;
break;
case 0x88:
r = ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
g = ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
b = ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
a = 255;
break;
}
}
default_clut.clut256[i] = RGBA(r, g, b, a);
}
return 0;
}
static av_cold int dvbsub_close_decoder(AVCodecContext *avctx)
{
DVBSubContext *ctx = avctx->priv_data;
DVBSubRegionDisplay *display;
delete_state(ctx);
while (ctx->display_list) {
display = ctx->display_list;
ctx->display_list = display->next;
av_free(display);
}
return 0;
}
static int dvbsub_read_2bit_string(uint8_t *destbuf, int dbuf_len,
const uint8_t **srcbuf, int buf_size,
int non_mod, uint8_t *map_table)
{
GetBitContext gb;
int bits;
int run_length;
int pixels_read = 0;
init_get_bits(&gb, *srcbuf, buf_size << 3);
while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
bits = get_bits(&gb, 2);
if (bits) {
if (non_mod != 1 || bits != 1) {
if (map_table)
*destbuf++ = map_table[bits];
else
*destbuf++ = bits;
}
pixels_read++;
} else {
bits = get_bits1(&gb);
if (bits == 1) {
run_length = get_bits(&gb, 3) + 3;
bits = get_bits(&gb, 2);
if (non_mod == 1 && bits == 1)
pixels_read += run_length;
else {
if (map_table)
bits = map_table[bits];
while (run_length-- > 0 && pixels_read < dbuf_len) {
*destbuf++ = bits;
pixels_read++;
}
}
} else {
bits = get_bits1(&gb);
if (bits == 0) {
bits = get_bits(&gb, 2);
if (bits == 2) {
run_length = get_bits(&gb, 4) + 12;
bits = get_bits(&gb, 2);
if (non_mod == 1 && bits == 1)
pixels_read += run_length;
else {
if (map_table)
bits = map_table[bits];
while (run_length-- > 0 && pixels_read < dbuf_len) {
*destbuf++ = bits;
pixels_read++;
}
}
} else if (bits == 3) {
run_length = get_bits(&gb, 8) + 29;
bits = get_bits(&gb, 2);
if (non_mod == 1 && bits == 1)
pixels_read += run_length;
else {
if (map_table)
bits = map_table[bits];
while (run_length-- > 0 && pixels_read < dbuf_len) {
*destbuf++ = bits;
pixels_read++;
}
}
} else if (bits == 1) {
pixels_read += 2;
if (map_table)
bits = map_table[0];
else
bits = 0;
if (pixels_read <= dbuf_len) {
*destbuf++ = bits;
*destbuf++ = bits;
}
} else {
(*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
return pixels_read;
}
} else {
if (map_table)
bits = map_table[0];
else
bits = 0;
*destbuf++ = bits;
pixels_read++;
}
}
}
}
if (get_bits(&gb, 6))
av_log(NULL, AV_LOG_ERROR, "DVBSub error: line overflow\n");
(*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
return pixels_read;
}
static int dvbsub_read_4bit_string(uint8_t *destbuf, int dbuf_len,
const uint8_t **srcbuf, int buf_size,
int non_mod, uint8_t *map_table)
{
GetBitContext gb;
int bits;
int run_length;
int pixels_read = 0;
init_get_bits(&gb, *srcbuf, buf_size << 3);
while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
bits = get_bits(&gb, 4);
if (bits) {
if (non_mod != 1 || bits != 1) {
if (map_table)
*destbuf++ = map_table[bits];
else
*destbuf++ = bits;
}
pixels_read++;
} else {
bits = get_bits1(&gb);
if (bits == 0) {
run_length = get_bits(&gb, 3);
if (run_length == 0) {
(*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
return pixels_read;
}
run_length += 2;
if (map_table)
bits = map_table[0];
else
bits = 0;
while (run_length-- > 0 && pixels_read < dbuf_len) {
*destbuf++ = bits;
pixels_read++;
}
} else {
bits = get_bits1(&gb);
if (bits == 0) {
run_length = get_bits(&gb, 2) + 4;
bits = get_bits(&gb, 4);
if (non_mod == 1 && bits == 1)
pixels_read += run_length;
else {
if (map_table)
bits = map_table[bits];
while (run_length-- > 0 && pixels_read < dbuf_len) {
*destbuf++ = bits;
pixels_read++;
}
}
} else {
bits = get_bits(&gb, 2);
if (bits == 2) {
run_length = get_bits(&gb, 4) + 9;
bits = get_bits(&gb, 4);
if (non_mod == 1 && bits == 1)
pixels_read += run_length;
else {
if (map_table)
bits = map_table[bits];
while (run_length-- > 0 && pixels_read < dbuf_len) {
*destbuf++ = bits;
pixels_read++;
}
}
} else if (bits == 3) {
run_length = get_bits(&gb, 8) + 25;
bits = get_bits(&gb, 4);
if (non_mod == 1 && bits == 1)
pixels_read += run_length;
else {
if (map_table)
bits = map_table[bits];
while (run_length-- > 0 && pixels_read < dbuf_len) {
*destbuf++ = bits;
pixels_read++;
}
}
} else if (bits == 1) {
pixels_read += 2;
if (map_table)
bits = map_table[0];
else
bits = 0;
if (pixels_read <= dbuf_len) {
*destbuf++ = bits;
*destbuf++ = bits;
}
} else {
if (map_table)
bits = map_table[0];
else
bits = 0;
*destbuf++ = bits;
pixels_read ++;
}
}
}
}
}
if (get_bits(&gb, 8))
av_log(NULL, AV_LOG_ERROR, "DVBSub error: line overflow\n");
(*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
return pixels_read;
}
static int dvbsub_read_8bit_string(uint8_t *destbuf, int dbuf_len,
const uint8_t **srcbuf, int buf_size,
int non_mod, uint8_t *map_table)
{
const uint8_t *sbuf_end = (*srcbuf) + buf_size;
int bits;
int run_length;
int pixels_read = 0;
while (*srcbuf < sbuf_end && pixels_read < dbuf_len) {
bits = *(*srcbuf)++;
if (bits) {
if (non_mod != 1 || bits != 1) {
if (map_table)
*destbuf++ = map_table[bits];
else
*destbuf++ = bits;
}
pixels_read++;
} else {
bits = *(*srcbuf)++;
run_length = bits & 0x7f;
if ((bits & 0x80) == 0) {
if (run_length == 0) {
return pixels_read;
}
} else {
bits = *(*srcbuf)++;
if (non_mod == 1 && bits == 1)
pixels_read += run_length;
}
if (map_table)
bits = map_table[0];
else
bits = 0;
while (run_length-- > 0 && pixels_read < dbuf_len) {
*destbuf++ = bits;
pixels_read++;
}
}
}
if (*(*srcbuf)++)
av_log(NULL, AV_LOG_ERROR, "DVBSub error: line overflow\n");
return pixels_read;
}
static void dvbsub_parse_pixel_data_block(AVCodecContext *avctx, DVBSubObjectDisplay *display,
const uint8_t *buf, int buf_size, int top_bottom, int non_mod)
{
DVBSubContext *ctx = avctx->priv_data;
DVBSubRegion *region = get_region(ctx, display->region_id);
const uint8_t *buf_end = buf + buf_size;
uint8_t *pbuf;
int x_pos, y_pos;
int i;
uint8_t map2to4[] = { 0x0, 0x7, 0x8, 0xf};
uint8_t map2to8[] = {0x00, 0x77, 0x88, 0xff};
uint8_t map4to8[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff};
uint8_t *map_table;
ff_dlog(avctx, "DVB pixel block size %d, %s field:\n", buf_size,
top_bottom ? "bottom" : "top");
for (i = 0; i < buf_size; i++) {
if (i % 16 == 0)
ff_dlog(avctx, "0x%8p: ", buf+i);
ff_dlog(avctx, "%02x ", buf[i]);
if (i % 16 == 15)
ff_dlog(avctx, "\n");
}
if (i % 16)
ff_dlog(avctx, "\n");
if (region == 0)
return;
pbuf = region->pbuf;
x_pos = display->x_pos;
y_pos = display->y_pos;
if ((y_pos & 1) != top_bottom)
y_pos++;
while (buf < buf_end) {
if (x_pos > region->width || y_pos > region->height) {
av_log(avctx, AV_LOG_ERROR, "Invalid object location!\n");
return;
}
switch (*buf++) {
case 0x10:
if (region->depth == 8)
map_table = map2to8;
else if (region->depth == 4)
map_table = map2to4;
else
map_table = NULL;
x_pos += dvbsub_read_2bit_string(pbuf + (y_pos * region->width) + x_pos,
region->width - x_pos, &buf, buf_end - buf,
non_mod, map_table);
break;
case 0x11:
if (region->depth < 4) {
av_log(avctx, AV_LOG_ERROR, "4-bit pixel string in %d-bit region!\n", region->depth);
return;
}
if (region->depth == 8)
map_table = map4to8;
else
map_table = NULL;
x_pos += dvbsub_read_4bit_string(pbuf + (y_pos * region->width) + x_pos,
region->width - x_pos, &buf, buf_end - buf,
non_mod, map_table);
break;
case 0x12:
if (region->depth < 8) {
av_log(avctx, AV_LOG_ERROR, "8-bit pixel string in %d-bit region!\n", region->depth);
return;
}
x_pos += dvbsub_read_8bit_string(pbuf + (y_pos * region->width) + x_pos,
region->width - x_pos, &buf, buf_end - buf,
non_mod, NULL);
break;
case 0x20:
map2to4[0] = (*buf) >> 4;
map2to4[1] = (*buf++) & 0xf;
map2to4[2] = (*buf) >> 4;
map2to4[3] = (*buf++) & 0xf;
break;
case 0x21:
for (i = 0; i < 4; i++)
map2to8[i] = *buf++;
break;
case 0x22:
for (i = 0; i < 16; i++)
map4to8[i] = *buf++;
break;
case 0xf0:
x_pos = display->x_pos;
y_pos += 2;
break;
default:
av_log(avctx, AV_LOG_INFO, "Unknown/unsupported pixel block 0x%x\n", *(buf-1));
}
}
}
static int dvbsub_parse_object_segment(AVCodecContext *avctx,
const uint8_t *buf, int buf_size)
{
DVBSubContext *ctx = avctx->priv_data;
const uint8_t *buf_end = buf + buf_size;
const uint8_t *block;
int object_id;
DVBSubObject *object;
DVBSubObjectDisplay *display;
int top_field_len, bottom_field_len;
int coding_method, non_modifying_color;
object_id = AV_RB16(buf);
buf += 2;
object = get_object(ctx, object_id);
if (!object)
return AVERROR_INVALIDDATA;
coding_method = ((*buf) >> 2) & 3;
non_modifying_color = ((*buf++) >> 1) & 1;
if (coding_method == 0) {
top_field_len = AV_RB16(buf);
buf += 2;
bottom_field_len = AV_RB16(buf);
buf += 2;
if (buf + top_field_len + bottom_field_len > buf_end) {
av_log(avctx, AV_LOG_ERROR, "Field data size too large\n");
return AVERROR_INVALIDDATA;
}
for (display = object->display_list; display; display = display->object_list_next) {
block = buf;
dvbsub_parse_pixel_data_block(avctx, display, block, top_field_len, 0,
non_modifying_color);
if (bottom_field_len > 0)
block = buf + top_field_len;
else
bottom_field_len = top_field_len;
dvbsub_parse_pixel_data_block(avctx, display, block, bottom_field_len, 1,
non_modifying_color);
}
/* } else if (coding_method == 1) {*/
} else {
av_log(avctx, AV_LOG_ERROR, "Unknown object coding %d\n", coding_method);
}
return 0;
}
static int dvbsub_parse_clut_segment(AVCodecContext *avctx,
const uint8_t *buf, int buf_size)
{
DVBSubContext *ctx = avctx->priv_data;
const uint8_t *buf_end = buf + buf_size;
int i, clut_id;
DVBSubCLUT *clut;
int entry_id, depth , full_range;
int y, cr, cb, alpha;
int r, g, b, r_add, g_add, b_add;
ff_dlog(avctx, "DVB clut packet:\n");
for (i=0; i < buf_size; i++) {
ff_dlog(avctx, "%02x ", buf[i]);
if (i % 16 == 15)
ff_dlog(avctx, "\n");
}
if (i % 16)
ff_dlog(avctx, "\n");
clut_id = *buf++;
buf += 1;
clut = get_clut(ctx, clut_id);
if (!clut) {
clut = av_malloc(sizeof(DVBSubCLUT));
if (!clut)
return AVERROR(ENOMEM);
memcpy(clut, &default_clut, sizeof(DVBSubCLUT));
clut->id = clut_id;
clut->next = ctx->clut_list;
ctx->clut_list = clut;
}
while (buf + 4 < buf_end) {
entry_id = *buf++;
depth = (*buf) & 0xe0;
if (depth == 0) {
av_log(avctx, AV_LOG_ERROR, "Invalid clut depth 0x%x!\n", *buf);
return AVERROR_INVALIDDATA;
}
full_range = (*buf++) & 1;
if (full_range) {
y = *buf++;
cr = *buf++;
cb = *buf++;
alpha = *buf++;
} else {
y = buf[0] & 0xfc;
cr = (((buf[0] & 3) << 2) | ((buf[1] >> 6) & 3)) << 4;
cb = (buf[1] << 2) & 0xf0;
alpha = (buf[1] << 6) & 0xc0;
buf += 2;
}
if (y == 0)
alpha = 0xff;
YUV_TO_RGB1_CCIR(cb, cr);
YUV_TO_RGB2_CCIR(r, g, b, y);
ff_dlog(avctx, "clut %d := (%d,%d,%d,%d)\n", entry_id, r, g, b, alpha);
if (depth & 0x80)
clut->clut4[entry_id] = RGBA(r,g,b,255 - alpha);
if (depth & 0x40)
clut->clut16[entry_id] = RGBA(r,g,b,255 - alpha);
if (depth & 0x20)
clut->clut256[entry_id] = RGBA(r,g,b,255 - alpha);
}
return 0;
}
static int dvbsub_parse_region_segment(AVCodecContext *avctx,
const uint8_t *buf, int buf_size)
{
DVBSubContext *ctx = avctx->priv_data;
const uint8_t *buf_end = buf + buf_size;
int region_id, object_id;
DVBSubRegion *region;
DVBSubObject *object;
DVBSubObjectDisplay *display;
int fill;
if (buf_size < 10)
return AVERROR_INVALIDDATA;
region_id = *buf++;
region = get_region(ctx, region_id);
if (!region) {
region = av_mallocz(sizeof(DVBSubRegion));
if (!region)
return AVERROR(ENOMEM);
region->id = region_id;
region->next = ctx->region_list;
ctx->region_list = region;
}
fill = ((*buf++) >> 3) & 1;
region->width = AV_RB16(buf);
buf += 2;
region->height = AV_RB16(buf);
buf += 2;
if (region->width * region->height != region->buf_size) {
av_free(region->pbuf);
region->buf_size = region->width * region->height;
region->pbuf = av_malloc(region->buf_size);
if (!region->pbuf)
return AVERROR(ENOMEM);
fill = 1;
}
region->depth = 1 << (((*buf++) >> 2) & 7);
if(region->depth<2 || region->depth>8){
av_log(avctx, AV_LOG_ERROR, "region depth %d is invalid\n", region->depth);
region->depth= 4;
}
region->clut = *buf++;
if (region->depth == 8)
region->bgcolor = *buf++;
else {
buf += 1;
if (region->depth == 4)
region->bgcolor = (((*buf++) >> 4) & 15);
else
region->bgcolor = (((*buf++) >> 2) & 3);
}
ff_dlog(avctx, "Region %d, (%dx%d)\n", region_id, region->width, region->height);
if (fill) {
memset(region->pbuf, region->bgcolor, region->buf_size);
ff_dlog(avctx, "Fill region (%d)\n", region->bgcolor);
}
delete_region_display_list(ctx, region);
while (buf + 5 < buf_end) {
object_id = AV_RB16(buf);
buf += 2;
object = get_object(ctx, object_id);
if (!object) {
object = av_mallocz(sizeof(DVBSubObject));
if (!object)
return AVERROR(ENOMEM);
object->id = object_id;
object->next = ctx->object_list;
ctx->object_list = object;
}
object->type = (*buf) >> 6;
display = av_mallocz(sizeof(DVBSubObjectDisplay));
if (!display)
return AVERROR(ENOMEM);
display->object_id = object_id;
display->region_id = region_id;
display->x_pos = AV_RB16(buf) & 0xfff;
buf += 2;
display->y_pos = AV_RB16(buf) & 0xfff;
buf += 2;
if ((object->type == 1 || object->type == 2) && buf+1 < buf_end) {
display->fgcolor = *buf++;
display->bgcolor = *buf++;
}
display->region_list_next = region->display_list;
region->display_list = display;
display->object_list_next = object->display_list;
object->display_list = display;
}
return 0;
}
static int dvbsub_parse_page_segment(AVCodecContext *avctx,
const uint8_t *buf, int buf_size)
{
DVBSubContext *ctx = avctx->priv_data;
DVBSubRegionDisplay *display;
DVBSubRegionDisplay *tmp_display_list, **tmp_ptr;
const uint8_t *buf_end = buf + buf_size;
int region_id;
int page_state;
if (buf_size < 1)
return AVERROR_INVALIDDATA;
ctx->time_out = *buf++;
page_state = ((*buf++) >> 2) & 3;
ff_dlog(avctx, "Page time out %ds, state %d\n", ctx->time_out, page_state);
if (page_state == 2) {
delete_state(ctx);
}
tmp_display_list = ctx->display_list;
ctx->display_list = NULL;
ctx->display_list_size = 0;
while (buf + 5 < buf_end) {
region_id = *buf++;
buf += 1;
display = tmp_display_list;
tmp_ptr = &tmp_display_list;
while (display && display->region_id != region_id) {
tmp_ptr = &display->next;
display = display->next;
}
if (!display) {
display = av_mallocz(sizeof(DVBSubRegionDisplay));
if (!display)
return AVERROR(ENOMEM);
}
display->region_id = region_id;
display->x_pos = AV_RB16(buf);
buf += 2;
display->y_pos = AV_RB16(buf);
buf += 2;
*tmp_ptr = display->next;
display->next = ctx->display_list;
ctx->display_list = display;
ctx->display_list_size++;
ff_dlog(avctx, "Region %d, (%d,%d)\n", region_id, display->x_pos, display->y_pos);
}
while (tmp_display_list) {
display = tmp_display_list;
tmp_display_list = display->next;
av_free(display);
}
return 0;
}
#ifdef DEBUG
static int save_display_set(DVBSubContext *ctx)
{
DVBSubRegion *region;
DVBSubRegionDisplay *display;
DVBSubCLUT *clut;
uint32_t *clut_table;
int x_pos, y_pos, width, height;
int x, y, y_off, x_off;
uint32_t *pbuf;
char filename[32];
static int fileno_index = 0;
x_pos = -1;
y_pos = -1;
width = 0;
height = 0;
for (display = ctx->display_list; display; display = display->next) {
region = get_region(ctx, display->region_id);
if (x_pos == -1) {
x_pos = display->x_pos;
y_pos = display->y_pos;
width = region->width;
height = region->height;
} else {
if (display->x_pos < x_pos) {
width += (x_pos - display->x_pos);
x_pos = display->x_pos;
}
if (display->y_pos < y_pos) {
height += (y_pos - display->y_pos);
y_pos = display->y_pos;
}
if (display->x_pos + region->width > x_pos + width) {
width = display->x_pos + region->width - x_pos;
}
if (display->y_pos + region->height > y_pos + height) {
height = display->y_pos + region->height - y_pos;
}
}
}
if (x_pos >= 0) {
pbuf = av_malloc(width * height * 4);
if (!pbuf)
return AVERROR(ENOMEM);
for (display = ctx->display_list; display; display = display->next) {
region = get_region(ctx, display->region_id);
x_off = display->x_pos - x_pos;
y_off = display->y_pos - y_pos;
clut = get_clut(ctx, region->clut);
if (clut == 0)
clut = &default_clut;
switch (region->depth) {
case 2:
clut_table = clut->clut4;
break;
case 8:
clut_table = clut->clut256;
break;
case 4:
default:
clut_table = clut->clut16;
break;
}
for (y = 0; y < region->height; y++) {
for (x = 0; x < region->width; x++) {
pbuf[((y + y_off) * width) + x_off + x] =
clut_table[region->pbuf[y * region->width + x]];
}
}
}
snprintf(filename, sizeof(filename), "dvbs.%d", fileno_index);
png_save(filename, pbuf, width, height);
av_free(pbuf);
}
fileno_index++;
return 0;
}
#endif
static int dvbsub_parse_display_definition_segment(AVCodecContext *avctx,
const uint8_t *buf,
int buf_size)
{
DVBSubContext *ctx = avctx->priv_data;
DVBSubDisplayDefinition *display_def = ctx->display_definition;
int dds_version, info_byte;
if (buf_size < 5)
return AVERROR_INVALIDDATA;
info_byte = bytestream_get_byte(&buf);
dds_version = info_byte >> 4;
if (display_def && display_def->version == dds_version)
return 0; // already have this display definition version
if (!display_def) {
display_def = av_mallocz(sizeof(*display_def));
if (!display_def)
return AVERROR(ENOMEM);
ctx->display_definition = display_def;
}
display_def->version = dds_version;
display_def->x = 0;
display_def->y = 0;
display_def->width = bytestream_get_be16(&buf) + 1;
display_def->height = bytestream_get_be16(&buf) + 1;
if (buf_size < 13)
return AVERROR_INVALIDDATA;
if (info_byte & 1<<3) { // display_window_flag
display_def->x = bytestream_get_be16(&buf);
display_def->y = bytestream_get_be16(&buf);
display_def->width = bytestream_get_be16(&buf) - display_def->x + 1;
display_def->height = bytestream_get_be16(&buf) - display_def->y + 1;
}
return 0;
}
static int dvbsub_display_end_segment(AVCodecContext *avctx, const uint8_t *buf,
int buf_size, AVSubtitle *sub)
{
DVBSubContext *ctx = avctx->priv_data;
DVBSubDisplayDefinition *display_def = ctx->display_definition;
DVBSubRegion *region;
DVBSubRegionDisplay *display;
AVSubtitleRect *rect;
DVBSubCLUT *clut;
uint32_t *clut_table;
int i;
int offset_x=0, offset_y=0;
sub->rects = NULL;
sub->start_display_time = 0;
sub->end_display_time = ctx->time_out * 1000;
sub->format = 0;
if (display_def) {
offset_x = display_def->x;
offset_y = display_def->y;
}
sub->num_rects = ctx->display_list_size;
if (sub->num_rects <= 0)
return AVERROR_INVALIDDATA;
sub->rects = av_mallocz_array(sub->num_rects * sub->num_rects,
sizeof(*sub->rects));
if (!sub->rects)
return AVERROR(ENOMEM);
i = 0;
for (display = ctx->display_list; display; display = display->next) {
region = get_region(ctx, display->region_id);
rect = sub->rects[i];
if (!region)
continue;
rect->x = display->x_pos + offset_x;
rect->y = display->y_pos + offset_y;
rect->w = region->width;
rect->h = region->height;
rect->nb_colors = 16;
rect->type = SUBTITLE_BITMAP;
rect->linesize[0] = region->width;
clut = get_clut(ctx, region->clut);
if (!clut)
clut = &default_clut;
switch (region->depth) {
case 2:
clut_table = clut->clut4;
break;
case 8:
clut_table = clut->clut256;
break;
case 4:
default:
clut_table = clut->clut16;
break;
}
rect->data[1] = av_mallocz(AVPALETTE_SIZE);
if (!rect->data[1]) {
av_free(sub->rects);
return AVERROR(ENOMEM);
}
memcpy(rect->data[1], clut_table, (1 << region->depth) * sizeof(uint32_t));
rect->data[0] = av_malloc(region->buf_size);
if (!rect->data[0]) {
av_free(rect->data[1]);
av_free(sub->rects);
return AVERROR(ENOMEM);
}
memcpy(rect->data[0], region->pbuf, region->buf_size);
#if FF_API_AVPICTURE
FF_DISABLE_DEPRECATION_WARNINGS
{
int j;
for (j = 0; j < 4; j++) {
rect->pict.data[j] = rect->data[j];
rect->pict.linesize[j] = rect->linesize[j];
}
}
FF_ENABLE_DEPRECATION_WARNINGS
#endif
i++;
}
sub->num_rects = i;
#ifdef DEBUG
save_display_set(ctx);
#endif
return 1;
}
static int dvbsub_decode(AVCodecContext *avctx,
void *data, int *data_size,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
DVBSubContext *ctx = avctx->priv_data;
AVSubtitle *sub = data;
const uint8_t *p, *p_end;
int segment_type;
int page_id;
int segment_length;
int i;
ff_dlog(avctx, "DVB sub packet:\n");
for (i=0; i < buf_size; i++) {
ff_dlog(avctx, "%02x ", buf[i]);
if (i % 16 == 15)
ff_dlog(avctx, "\n");
}
if (i % 16)
ff_dlog(avctx, "\n");
if (buf_size <= 6 || *buf != 0x0f) {
ff_dlog(avctx, "incomplete or broken packet");
return AVERROR_INVALIDDATA;
}
p = buf;
p_end = buf + buf_size;
while (p_end - p >= 6 && *p == 0x0f) {
p += 1;
segment_type = *p++;
page_id = AV_RB16(p);
p += 2;
segment_length = AV_RB16(p);
p += 2;
if (p_end - p < segment_length) {
ff_dlog(avctx, "incomplete or broken packet");
return -1;
}
if (page_id == ctx->composition_id || page_id == ctx->ancillary_id ||
ctx->composition_id == -1 || ctx->ancillary_id == -1) {
int ret = 0;
switch (segment_type) {
case DVBSUB_PAGE_SEGMENT:
ret = dvbsub_parse_page_segment(avctx, p, segment_length);
break;
case DVBSUB_REGION_SEGMENT:
ret = dvbsub_parse_region_segment(avctx, p, segment_length);
break;
case DVBSUB_CLUT_SEGMENT:
ret = dvbsub_parse_clut_segment(avctx, p, segment_length);
break;
case DVBSUB_OBJECT_SEGMENT:
ret = dvbsub_parse_object_segment(avctx, p, segment_length);
break;
case DVBSUB_DISPLAYDEFINITION_SEGMENT:
ret = dvbsub_parse_display_definition_segment(avctx, p,
segment_length);
break;
case DVBSUB_DISPLAY_SEGMENT:
ret = dvbsub_display_end_segment(avctx, p, segment_length, sub);
*data_size = ret;
break;
default:
ff_dlog(avctx, "Subtitling segment type 0x%x, page id %d, length %d\n",
segment_type, page_id, segment_length);
break;
}
if (ret < 0)
return ret;
}
p += segment_length;
}
return p - buf;
}
AVCodec ff_dvbsub_decoder = {
.name = "dvbsub",
.long_name = NULL_IF_CONFIG_SMALL("DVB subtitles"),
.type = AVMEDIA_TYPE_SUBTITLE,
.id = AV_CODEC_ID_DVB_SUBTITLE,
.priv_data_size = sizeof(DVBSubContext),
.init = dvbsub_init_decoder,
.close = dvbsub_close_decoder,
.decode = dvbsub_decode,
};
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